Peroxydisulfuric acid

Peroxydisulfuric acid

Names
IUPAC names μ-peroxido-bis(hydroxidodioxidosulfur) peroxydisulfuric acid
Other names Persulfuric acid, Peroxodisulfuric acid
Identifiers
CAS Number	13445-49-3
3D model (Jmol)	Interactive image
ChEBI	CHEBI:29268
ChemSpider	22822
PubChem	24413
InChI InChI=1S/H2O8S2/c1-9(2,3)7-8-10(4,5)6/h(H,1,2,3)(H,4,5,6) Key: JRKICGRDRMAZLK-UHFFFAOYSA-N InChI=1/H2O8S2/c1-9(2,3)7-8-10(4,5)6/h(H,1,2,3)(H,4,5,6)/f/h1,4H InChI=1/H2O8S2/c1-9(2,3)7-8-10(4,5)6/h(H,1,2,3)(H,4,5,6) Key: JRKICGRDRMAZLK-UHFFFAOYAS
SMILES O=S(=O)(OOS(=O)(=O)O)O
Properties
Chemical formula	H2O8S2
Molar mass	194.13 g·mol^−1
Appearance	Colourless solid
Melting point	65 °C (149 °F; 338 K) (decomposes)
Solubility in water	soluble
Related compounds
Other cations	Potassium persulfate Sodium persulfate Ammonium persulfate
Related compounds	Peroxymonosulfuric acid Pyrosulfuric acid
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Infobox references

Peroxydisulfuric acid is the inorganic compound with the chemical formula H₂S₂O₈. Also called Marshall's acid, it is sulfur oxoacid.^[1] In structural terms it can be written HO₃SOOSO₃H. It contains sulfur in its +6 oxidation state and a peroxide group. Its salts, commonly known as persulfates, are industrially important as powerful oxidizing agents.

The acid is prepared by the reaction of chlorosulfuric acid with hydrogen peroxide:^[2]

2ClSO₃H + H₂O₂ → H₂S₂O₈ + 2 HCl

See also

Peroxymonosulfuric acid

References

1. Greenwood, Norman N.; Earnshaw, Alan (1997). Chemistry of the Elements (2nd ed.). Butterworth-Heinemann. ISBN 0-08-037941-9.
2. Harald Jakob, Stefan Leininger, Thomas Lehmann, Sylvia Jacobi, Sven Gutewort (2005), "Peroxo Compounds, Inorganic", Ullmann's Encyclopedia of Industrial Chemistry, Weinheim: Wiley-VCH, doi:10.1002/14356007.a19_177.pub2